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Description of Business and Liquidity (Details Narrative) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Nov. 27, 2019 | Oct. 03, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Cash, cash equivalents |  |  | $ 16,395 | $ 10,159 | $ 5,097 | $ 4,972
Working capital |  |  | $ 29,280 |  |  |
Common Stock, Preferred Stock, Warrants, Debt Securities, and Units, or Any Combination [Member] |  |  |  |  |  |
Sale of stock, description of transaction | The Company has on file a shelf registration statement on Form S-3 that was declared effective by the Securities and Exchange Commission (the "SEC") on November 27, 2019. Pursuant to the shelf registration statement, the Company may offer to the public from time to time, in one or more offerings, up to $60,000 of its common stock, preferred stock, warrants, debt securities, and units, or any combination of the foregoing, at prices and on terms to be determined at the time of any such offering. |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt instrument, face amount |  | $ 10,000 |  |  |  |
Line of credit facility, expiration period |  | 5 years |  |  |  |
Convertible Unsecured Promissory Note [Member] |  |  |  |  |  |
Debt instrument, face amount |  | $ 5,000 |  |  |  |
Debt instrument, interest rate |  | 10.00% |  |  |  |
Two Senior Secured Term Loan [Member] |  |  |  |  |  |
Debt instrument, face amount |  | $ 30,000 |  |  |  |
Facilities One [Member] |  |  |  |  |  |
Debt instrument, face amount |  | 20,000 |  |  |  |
Facilities Two [Member] |  |  |  |  |  |
Debt instrument, face amount |  | $ 10,000 |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Sale of stock |  | 50 |  |  |  |
Sale of stock price per share |  | $ 0.01 |  |  |  |
Aggregate purchase price |  | $ 50,000 |  |  |  |

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